package com.lbjhan.rpc.consumer.server;

import com.lbjhan.rpc.consumer.handler.RpcNettyServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 基于Netty的服务端
 */
@Component
public class RpcNettyServer implements DisposableBean {
    private NioEventLoopGroup bossGroup;
    private NioEventLoopGroup workerGroup;

    @Autowired
    RpcNettyServerHandler rpcNettyServerHandler;

    public void startServer(String ip, int port){
        try {
            // 1. 创建线程组
            bossGroup = new NioEventLoopGroup(1);
            workerGroup = new NioEventLoopGroup();
            // 2. 创建服务端启动助手
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            // 3. 设置参数
            serverBootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {

                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            //添加String编解码器
                            pipeline.addLast(new StringDecoder());
                            pipeline.addLast(new StringEncoder());
                            //业务处理类
                            pipeline.addLast(rpcNettyServerHandler);
                        }
                    });
            // 4. 绑定端口号
            ChannelFuture channelFuture = serverBootstrap.bind(ip, port).sync();
            System.out.println("----- 服务器启动成功 -----");
            channelFuture.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(bossGroup != null)
                bossGroup.shutdownGracefully();

            if(workerGroup != null)
                workerGroup.shutdownGracefully();
        }

    }

    @Override
    public void destroy() throws Exception {
        if(bossGroup != null)
            bossGroup.shutdownGracefully();

        if(workerGroup != null)
            workerGroup.shutdownGracefully();
    }
}
